Event: Walker Shield

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Opponent	Rating	Result
Ethan Hayhoe	998	0 - 1
Tejas Pai	600	1 - 0
Thomas Milligan	1406	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

868 = (3004 + 400 * (1 - 2)) / 3)